watchOS 3.0 (build 14S5321a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-08-15T16:54:25Z. The update package is 558.37 MB. This is a delta (partial) update that requires 2.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cb1973449195a0c2ba0d471266445360a9880487.zip.